EP 0692555 B1 19980422 - Annealing and descaling method for stainless steel
Title (en)
Annealing and descaling method for stainless steel
Title (de)
Verfahren zum Glühen und zur Entzunderung von rostfreiem Stahl
Title (fr)
Procédé de recuit et décapage d'acier inoxydable
Publication
Application
Priority
US 27338594 A 19940711
Abstract (en)
[origin: EP0692555A1] A method for processing stainless steel strip or sheet provides for cleaning the surface of the stainless steel with a solution selected from the group consisting of water and alkaline-based and acid-based compounds to reduce oxide scale formation and to provide more uniform oxide scale during subsequent annealing by transverse-flux induction heating up to an annealing temperature of about 2300 degrees Fahrenheit and then electrolytically descaling by immersing in an aqueous solution electrolyte of one neutral salt, preferably, sodium sulfate maintained at a temperature in excess of 150 degrees Fahrenheit and with the use of low current density of 0.1 to 1.0 amperes per square inch to descale the steel substantially entirely, and thereafter applying a water rinse combined with wet wiping to the electrolytically-descaled stainless steel. <MATH>
IPC 1-7
IPC 8 full level
C21D 1/42 (2006.01); C21D 1/26 (2006.01); C21D 1/28 (2006.01); C21D 9/60 (2006.01); C23G 1/08 (2006.01); C23G 1/19 (2006.01); C25F 1/06 (2006.01)
CPC (source: EP KR US)
C21D 9/60 (2013.01 - EP KR US); C25F 1/06 (2013.01 - EP KR US); Y02P 10/25 (2015.11 - EP US)
Designated contracting state (EPC)
AT BE DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0692555 A1 19960117; EP 0692555 B1 19980422; AT E165402 T1 19980515; AU 2164495 A 19960125; AU 708994 B2 19990819; BR 9503245 A 19970930; CA 2152453 A1 19960112; CN 1056651 C 20000920; CN 1121960 A 19960508; CZ 177495 A3 19960214; DE 69502139 D1 19980528; DE 69502139 T2 19980924; ES 2117834 T3 19980816; FI 110325 B 20021231; FI 953374 A0 19950710; FI 953374 A 19960112; IN 190764 B 20030823; JP H08170200 A 19960702; KR 100337038 B1 20021031; KR 960003832 A 19960223; PL 179348 B1 20000831; PL 309561 A1 19960122; US 5490908 A 19960213; ZA 955326 B 19960223
DOCDB simple family (application)
EP 95304145 A 19950615; AT 95304145 T 19950615; AU 2164495 A 19950614; BR 9503245 A 19950707; CA 2152453 A 19950622; CN 95108912 A 19950711; CZ 177495 A 19950710; DE 69502139 T 19950615; ES 95304145 T 19950615; FI 953374 A 19950710; IN 1149DE1995 A 19950620; JP 17501495 A 19950711; KR 19950017974 A 19950629; PL 30956195 A 19950710; US 27338594 A 19940711; ZA 955326 A 19950627